Nutrition_CH9_Water-Soluble_Vitamins

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PicOlio
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124685
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Nutrition_CH9_Water-Soluble_Vitamins
Updated:
2011-12-20 21:19:49
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water soluble vitamins
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Human Nutrition CH9 - The Water-Soluble Vitamins
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  1. When water-soluble vitamins are found in urine in healthy individuals, it generally means that they have been:

    A. undigested due to poor enzyme quality
    B. not absorbed
    C. consumed in excess of body needs
    D. stored in liver, bone, and adipose tissue
    C.
    (this multiple choice question has been scrambled)
  2. Acting as a coenzyme is a major function of:

    A. vitamin C
    B. vitamin D
    C. all water-soluble vitamins
    D. B vitamins
    D.
    (this multiple choice question has been scrambled)
  3. Vitamin C is important in collagen synthesis because it acts:

    A. to methylate homocysteine
    B. to release energy from nutrients
    C. to restore iron to a reduced state
    D. to synthesize red blood cells
    C.
    (this multiple choice question has been scrambled)
  4. Although excess absorbed ascorbic acid is excreted in urine, the body has an estimated maximal body pool of 1500 mg which can be maintained with intakes of _____ vitamin C per day.

    A. 100-200 mg
    B. 200-300 mg
    C. 500-600 mg
    D. 1000-1200 mg
    A.
    (this multiple choice question has been scrambled)
  5. Vitamin C is important in wound healing and maintenance of skin, tendons, cartilage, bone and dentine due to its importance to which enzyme?

    A. glycogen phosphorylase
    B. FMN phosphatase
    C. acetyle CoA carboxylase
    D. prolyl hydroxylase
    D.
    (this multiple choice question has been scrambled)
  6. Which of the following vitamins is important for entry of long-chain fatty acids into the mitochondrial matrix?

    A. vitamin C
    B. vitamin B12
    C. biotin
    D. folate
    A.
    (this multiple choice question has been scrambled)
  7. Vitamin C acts in all of the following capacities EXCEPT:

    A. antirachitic agent
    B. antioxidant
    C. prooxidant
    D. reducing agent
    A.
    (this multiple choice question has been scrambled)
  8. Thiamin plays major roles in all of the following EXCEPT:

    A. energy transformation
    B. collagen formation
    C. synthesis of pentoses and NADPH
    D. membrane and nerve conduction
    B.
    (this multiple choice question has been scrambled)
  9. Transketolase is an enzyme in the hexose monophosphate shunt that requires which of the following vitamins as a coenzyme?

    A. biotin
    B. thiamin
    C. vitamin C
    D. folate
    B.
    (this multiple choice question has been scrambled)
  10. Beriberi is a symptom of deficiency of which vitamin?

    A. thiamin
    B. niacin
    C. riboflavin
    D. biotin
    A.
    (this multiple choice question has been scrambled)
  11. B complex vitamins important for hematopoiesis include all of the following EXCEPT:

    A. folic acid
    B. thiamin
    C. vitamin B6
    D. vitamin B12
    B.
    (this multiple choice question has been scrambled)
  12. Flavoproteins are especially important in _____.

    A. reducing metals
    B. carboxylations
    C. hydroxylations
    D. oxidation reduction reactions
    D.
    (this multiple choice question has been scrambled)
  13. Tryptophan catabolism diverts about 3% of dietary intake to the liver synthesis of which vitamin?

    A. biotin
    B. niacin
    C. folate
    D. thiamin
    B.
    (this multiple choice question has been scrambled)
  14. NADPH produced in the hexose monophosphate shunt is a reduced form of one of the coenzyme structures of which vitamin?

    A. vitamin C
    B. niacin
    C. riboflavin
    D. thiamin
    B.
    (this multiple choice question has been scrambled)
  15. Symptoms of pellagra include _____.

    A. cheilosis and glossitis
    B. dermatitis, dementia, diarrhea, and death
    C. alopecia
    D. bleeding gums
    B.
    (this multiple choice question has been scrambled)
  16. Which of the water-soluble vitamins is a component of acyl carrier protein, a necessary part of the fatty acid synthase complex?

    A. pyridoxine
    B. pantothenic acid
    C. folic acid
    D. riboflavin
    B.
    (this multiple choice question has been scrambled)
  17. Which vitamin, as part of coenzyme A, forms thio esters with carboxylic acids such as succinic acid and acetic acid?

    A. pantothenic acid
    B. vitamin E
    C. pyridoxal phosphate
    D. folic acid
    A.
    (this multiple choice question has been scrambled)
  18. Which vitamin is a coenzyme needed for particular enzymes to add a carboxyl group to an existing molecule?

    A. vitamin B12
    B. biotin
    C. thiamin
    D. vitamin C
    B.
    (this multiple choice question has been scrambled)
  19. A genetic deficiency of what enzyme is associated with these symptoms: lethargy, depression, hallucinations, muscle pain, paresthesia in extremeties, anorexia, nausea, alopecia, and red dermatitis?

    A. phenylalanine hydroxylase
    B. methylenetetrahydrofolate reductase
    C. thiaminase
    D. biotinidase
    D.
    (this multiple choice question has been scrambled)
  20. Folate in supplements is more easily absorbed than folate in food, making one dietary folate equivalent (DFE) equal to one mcg food folate and _____ mcg from a supplement or fortified food consumed with a meal.

    A. 1.2 mcg
    B. 1.0 mcg
    C. 0.5 mcg
    D. 0.6 mcg
    D.
    (this multiple choice question has been scrambled)
  21. Ingested folate requires the addition of _____ to make it active as a coenzyme.

    A. one hydroxyl
    B. four hydrogens
    C. one carboxyl
    D. two hydrogens
    B.
    (this multiple choice question has been scrambled)
  22. Tetrahydrofolate is vitally important for dividing cells during growth and cancer and knowledge of this need is used in cancer treatment by giving the drug Methotrexate to inhibit the enzyme _____.

    A. folypolyglutamate synthetase
    B. FIGLU
    C. conjugase
    D. dihydrofolate reductase
    D.
    (this multiple choice question has been scrambled)
  23. A vitamin B12 deficiency is usually associated with lack of adequate _____.

    A. dietary energy as calories
    B. dietary intake of B12
    C. intrinsic factor
    D. folate polyglutamate
    C.
    (this multiple choice question has been scrambled)
  24. Which group of individuals is most likely to have a vitamin B12 deficiency?

    A. lacto-ovo vegetarians
    B. elderly Caucasians
    C. breastfeeding infants of omnivore mothers
    D. athletes
    B.
    (this multiple choice question has been scrambled)
  25. Vitamin B6 is a coenzyme for > 100 enzymes mostly involved in _____.

    A. collagen synthesis
    B. amino acid metabolism
    C. energy metabolism
    D. fatty acid synthesis
    B.
    (this multiple choice question has been scrambled)
  26. FMN is required for the metabolism of what other vitamin to its primary coenzyme form?

    A. vitamin B12
    B. folate
    C. vitamin B6
    D. vitamin C
    C.
    (this multiple choice question has been scrambled)
  27. Vitamin B6 functions importantly in all of the following EXCEPT _____.

    A. transamimation of amino acids
    B. glycogen breakdown
    C. synthesis of niacin
    D. synthesis of fatty acids
    D.
    (this multiple choice question has been scrambled)
  28. Hypochromic, microcytic anemia is a deficiency symptom of inadequate intake of _____.

    A. vitamin B12
    B. vitamin B6
    C. folate
    D. biotin
    B.
    (this multiple choice question has been scrambled)
  29. High intakes of pyridoxine greater than 100 mg/d may cause _____.

    A. alopecia
    B. neuropathy
    C. pellagra
    D. scurvy
    B.
    (this multiple choice question has been scrambled)
  30. Nutrients can affect expression of our genes in all of the following ways except one; thus nutrients CANNOT:

    A. alter the base sequence of DNA in a cell.
    B. interact with DNA causing synthesis of needed proteins
    C. compensate for gaps in our DNA
    D. interfere with expression of genes that cause harmful effects
    A.
    (this multiple choice question has been scrambled)

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